linux-kernel - Re: [PATCH 1/1] vhost_task: Fix vhost_task

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Message-ID: <20230323084648-mutt-send-email-mst@kernel.org>
Date:   Thu, 23 Mar 2023 08:47:15 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Christian Brauner <brauner@...nel.org>
Cc:     Mike Christie <michael.christie@...cle.com>,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, sgarzare@...hat.com,
        jasowang@...hat.com, stefanha@...hat.com,
        syzbot+6b27b2d2aba1c80cc13b@...kaller.appspotmail.com
Subject: Re: [PATCH 1/1] vhost_task: Fix vhost_task_create return value

On Thu, Mar 23, 2023 at 12:50:49PM +0100, Christian Brauner wrote:
> On Thu, Mar 23, 2023 at 07:43:04AM -0400, Michael S. Tsirkin wrote:
> > On Thu, Mar 23, 2023 at 11:44:45AM +0100, Christian Brauner wrote:
> > > On Thu, Mar 23, 2023 at 03:37:19AM -0400, Michael S. Tsirkin wrote:
> > > > On Wed, Mar 22, 2023 at 01:56:05PM -0500, Mike Christie wrote:
> > > > > vhost_task_create is supposed to return the vhost_task or NULL on
> > > > > failure. This fixes it to return the correct value when the allocation
> > > > > of the struct fails.
> > > > > 
> > > > > Fixes: 77feab3c4156 ("vhost_task: Allow vhost layer to use copy_process") # mainline only
> > > > > Reported-by: syzbot+6b27b2d2aba1c80cc13b@...kaller.appspotmail.com
> > > > > Signed-off-by: Mike Christie <michael.christie@...cle.com>
> > > > 
> > > > Acked-by: Michael S. Tsirkin <mst@...hat.com>
> > > > 
> > > > The affected patch is not upstream yet, right?
> > > > I don't know if the tree in question allows rebases - linux-next
> > > > does. So ideally it would be squashed to avoid issues during bisect.
> > > > Still it's error path so I guess not a tragedy even without squashing.
> > > 
> > > I tend to not rebase once stuff has been in linux-next but I make
> > > exceptions as long as it's before -rc4. For now I've put the patch on
> > > top (see the other mail I sent) but if it's really important I can
> > > squash it after the weekend (I'll be mostly afk until then.).
> > 
> > Hard to say how important, but I'd prefer that, yes.
> 
> Ok, fold the fixup into
> 
> e297cd54b3f8 vhost_task: Allow vhost layer to use copy_process
> 
> the series is now at:
> 
> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git
> branch: kernel.user_worker
> 
> 1a5f8090c6de vhost: move worker thread fields to new struct
> e297cd54b3f8 vhost_task: Allow vhost layer to use copy_process
> 89c8e98d8cfb fork: allow kernel code to call copy_process
> 094717586bf7 fork: Add kernel_clone_args flag to ignore signals
> 11f3f500ec8a fork: add kernel_clone_args flag to not dup/clone files
> 54e6842d0775 fork/vm: Move common PF_IO_WORKER behavior to new flag
> c81cc5819faf kernel: Make io_thread and kthread bit fields
> 73e0c116594d kthread: Pass in the thread's name during creation
> cf587db2ee02 kernel: Allow a kernel thread's name to be set in copy_process
> e0a98139c162 csky: Remove kernel_thread declaration

Thanks a lot! Mike could you give it a spin to make sure all is well?

-- 
MST